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(a) Optical images of the polished facets of Ge core/ZnSe cladding/SiO2 matrix waveguides with increasing ZnSe thickness under 100× magnification. Theoretical (black circles) and experimental (open red circles) single pass optical losses are shown for (b) λ = 3.39 μm and (c) λ = 10.64 μm.
(a) Schematic of the envisioned fiber element for infrared imaging. Optical micrographs (side view) of the microstructured optical fiber template (b) before deposition, (c) after deposition of the ZnSe cladding, and (d) after deposition of the Ge core.
Optical micrographs of the polished narrow facet of the fiber element under (a) 20× and (c) 100× magnification. Optical micrographs of the wider fiber element facet under (b) 20× and (d) 100× magnification showing the hexagonal array of Ge core/ZnSe cladding waveguides in the SiO2 matrix.
(a) Optical micrograph of the “λ/N” metal mask pattern with sub-wavelength features fabricated at the input facet of the fiber element (b, inset). Scanning electron micrograph (SEM) of the metal layer covering a single waveguide exposed by FIB assisted milling. (c) Schematic of the imaging set-up; M1, M2, M: gold mirrors, L: coupling lens, F: fiber element, O: collecting objective, C: camera, P: power meter. Intensity profile of the transmitted “λ/N” image for (d) λ = 3.39 μm, and (e) λ = 10.64 μm. The scale bars in (d) and (e) have been calibrated with respect to the scale bar in(a).
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